After studying classics and training as a barrister in Dublin, Barry, the son of a respected Catholic solicitor in Limerick, joined the Munster circuit. Having ‘proved himself a brilliant and skilful advocate in criminal as well as in civil cases’, he was rapidly advanced to the position of crown prosecutor. In July 1859 he was made a QC at the early age of 36 and appointed crown prosecutor for Dublin.
Barry resigned the law advisership in July 1865, after it was ascertained that retaining the office would disqualify him from sitting in the Commons.
An ‘earnest and outspoken Liberal of the old type’, Barry entered the Commons as ‘a firm supporter of Lord Palmerston’s government’.
In 1872 Barry was appointed a puisine judge of the Irish court of queen’s bench and served on the north-western circuit. Having performed to the satisfaction of ministers in prominent cases such as the Maamtrasna murder trial, he was promoted to the Irish court of appeal in 1883, his Catholicism counting in his favour.
